Low-field magnetoresistance in La0.7Sr0.3MnO3/BaTiO3 composites
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A manganite composite series of (1 − x)La0.7Sr0.3MnO3/xBaTiO3 (x = 0, 0.06, 0.12, and 0.18) has been fabricated by solid-state reaction combined with a high-energy mechanical milling method. Experimental results revealed that the insulator–metal transition temperature was shifted towards lower temperatures, and resistivity increases with increasing BaTiO3 content in (1 − x)La0.7Sr0.3MnO3/xBaTiO3. Meanwhile, the ferromagnetic–paramagnetic transition temperature was almost unchanged. The increase in magnetoresistance was observed in the all composites at whole measurement temperatures under an applied magnetic field of 3 kOe. Here, temperature dependences of magnetoresistance display a Curie–Weiss law-like behavior. The nature of this phenomenon is explained in detail.
KeywordsBaTiO3 Manganite Grain Boundary Magnetoelectric Coupling Show Temperature Dependence
This work in Vietnam was supported by the NAFOSTED under grant No. 103.02.-2011.44, and partly supported by the Converging Research Center Program funded by the Ministry of Education, Science and Technology (2012K001431) in Korea. The authors are also thankful to National Key Laboratory for Electronic and Devices, IMS, Vietnam.